Hvac Ductwork Hvac Duct Design Example

Ductwork is simply an air delivery system.

Hvac ductwork hvac duct design example.

Residential hvac design testing requirements. The manual d is a complete schematic drawing of the duct system including locations and sizes of trunk lines branch ducts outlet registers an inlet grilles. Below is a simple model for determining duct sizes. This course is an individual unit in the professional certificate in hvac r fundamentals.

I ll follow that up with articles on the process we use in designing duct systems including available static pressure equivalent length and choosing fittings. The model applies to system up to 60 feet from unit to register. How to design a duct system. Rectangular ells tees and reducers rectangular side take offs and vertical ells multiple fittings in a duct system basic how to ductwork installation.

Include any options that modify the mechanical layout. This hvac for beginners section begins here with a discussion about forced air duct systems the basics the how and why of duct sizing. Manual j s and d calculations are required for each model. In this video we ll be learning how to size and design a ductwork for efficiency.

Today i ll start with what you do in the hvac design process before you get to the duct design phase manual d as well as the physics of air flow when it s constrained by ducts. Includes a full worked example as well as usin. For example if the gauge reads 10 psig then using the above equation the absolute pressure would be 24. Refer to the links on the left for more information.

System is designed to move 3 ton of a c or 1200 cfm. Because of the complexity of designing duct systems we highly recommend using the acca manual d for sizing ductwork or consulting a professional hvac contractor. Use insulated duct or duct board in unheated spaces. Always stagger take off ducts by 12 to maintain pressure.

This course is designed to familiarise you with the design selection and application of ductwork systems in hvac applications. Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less. 2 all models must have a mechanical plan showing furnace size and location along with duct size and location. Flexible duct work must be stretched tightly for maximum air flow.

This includes materials selection noise duct sealing leakage and delivering energy efficient ductwork solutions. This includes types of fittings used. 10 psig 14 7 psi 24 7 psia. Residential hvac duct drawings by geoffrey r.

1 psi equals 27 7 inches of water gauge.